如何在不停止 while 循环的情况下运行 time.sleep()

Question

有没有一种方法可以在不干扰循环的情况下从无限 while 循环中调用具有 wait(time.sleep()) 的函数？我正在尝试运行一些需要等待几秒钟的任务，但问题是当等待过程发生时 while 循环也会停止。这是我尝试过的- 这是我的代码：

import cv2
import time

def waiting():
    print("Inside function")
    # Running Some Tasks
    time.sleep(5)
    print("Done sleeping")


def main():
    cap = cv2.VideoCapture(0)

    while True:
        ret, frame = cap.read()
        cv2.imshow("Webcam", frame)

        k = cv2.waitKey(10)
        if k == 32:  # Press SPACEBAR for wait function
            waiting()
        elif k == 27:  # Press ESC to stop code
            break
    cap.release()
    cv2.destroyAllWindows()


if __name__ == "__main__":
    main()

Answer 1

你应该使用线程。看起来计算机正在同时执行这两项操作。

import threading

t = threading.Thread(target=function)
t.start()

Answer 2

您目前正在单线程脚本中工作。你应该使用 threading or multiprocessing. This makes (it look like) multiple processes (are) active. Dependent on if you use threading or multiprocessing.

Answer 3

感谢@JLT 和@TerePiim 的快速回复。以下是可能从中受益的任何人的更新代码：

import cv2
import time
import threading


def waiting():
    print("Inside parallel function")
    # Running some Tasks
    time.sleep(5)
    print("Done sleeping")


def main():
    cap = cv2.VideoCapture(0)
    while True:
        ret, frame = cap.read()
        cv2.imshow("Webcam", frame)
        k = cv2.waitKey(10)
        if k == 32:  # Press SPACEBAR for wait function
            t = threading.Thread(target=waiting)
            t.start()

        elif k == 27:  # Press ESC to stop code
            break
    cap.release()
    cv2.destroyAllWindows()


if __name__ == "__main__":
    main()

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